Operating Systems Online Quiz 1

The given correct answer is close(). The CloseHandle() function in the Windows operating system is used to close an open handle to a file or an input/output (I/O) device. It is not related to any of the mentioned UNIX functions (fork(), open(), read()). The close() function in UNIX is used to close a file descriptor after it is no longer needed. Therefore, the correct answer is close().

The operating system is considered a program because it is a set of instructions or code that controls and manages the computer's hardware and software resources. It provides a platform for other programs to run on and facilitates communication between the hardware and software components of the computer system. The operating system is responsible for managing tasks, memory, input/output devices, and file systems, among other things. Therefore, it fits the definition of a program as it performs a specific set of functions to enable the computer to operate.

The correct answer is O_RDWR. This mode is used for opening a file in both reading and writing. O_RDONLY is used for opening a file in read-only mode, O_WRONLY is used for opening a file in write-only mode, and O_WDR is not a valid mode for opening a file.

The kernel is the correct answer because it is one of the main components of an operating system. It is responsible for managing the system's resources, such as memory and hardware devices, and acts as a bridge between the software and hardware. The kernel also handles tasks such as process management, file system access, and input/output operations.

The backslash is often used as part of a path in computer systems. It is commonly used to separate directories or folders within a file path. For example, in a Windows operating system, the backslash is used to separate folders in a file path like C:\Program Files\Example.

Programs of the operating system usually end "normally" means that they terminate without any errors or issues. This implies that the program has completed its execution successfully and has followed the expected flow of execution.

When we execute a C program, the CPU runs in user mode. In this mode, the program has limited access to system resources and cannot perform privileged operations. The user mode provides a level of protection and prevents the program from interfering with other processes or the operating system. It ensures that the program only has access to its allocated memory and cannot modify critical system files or configurations.

Before the days of Windows, users interfaced with the operating system through a graphical interface. This means that instead of typing commands into a command line, users could interact with the operating system using a visual representation of buttons, menus, and icons. This made it easier for users to navigate and interact with the system, as they could simply click on options instead of memorizing and typing commands.

The correct answer is "information maintenance" because getting device attributes of a computer system involves collecting and managing information about the devices connected to the system. This process includes gathering details such as device type, status, configuration, and capabilities, which are essential for maintaining and updating the system's information database. It does not involve controlling processes, managing files, or directly managing the devices themselves.

The correct answer is "write" because the write system call is used to write data from a buffer to a file descriptor. It allows the program to send data to an output device or file.